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How to enable Keep-Alive?

How to make microrestd send Connection: Keep-Alive header?
I'm asking because nametag REST server is not sending Connection: Keep-Alive header. (afaik)
It seems that libmicrohttpd sends the Connection: Keep-Alive header by default but microrestd does not.

I have noticed that tests/libmicrohttpd_fileserver sends Connection: Keep-Alive header but tests/fileserver does not.

Reproduce/What I did

Compile tests.

cd tests
make
echo "FILE_CONTENT" > filename # create dummy file

Run tests/libmicrohttpd_fileserver

>>> ./libmicrohttpd_fileserver 8080
Running...

Test Keep-Alive

>>> curl -v 'http://127.0.0.1:8080/filename' --keepalive-time 42
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /filename HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Connection: Keep-Alive
< Content-Length: 13
< Date: Tue, 20 Feb 2018 16:27:15 GMT
< 
FILE_CONTENT
* Connection #0 to host 127.0.0.1 left intact

Notice < Connection: Keep-Alive and * Connection #0 to host 127.0.0.1 left intact.

Run tests/fileserver

>>> ./fileserver 8080 10 10
Tue 20. Feb 2018 17:27:31	REST server starting, port 8080, max connections 10, timeout 0, max request body size 0, min generated 1024.

Test Keep-Alive

>>> curl -v 'http://127.0.0.1:8080/filename' --keepalive-time 42
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET /filename HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.58.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Connection: close
< Access-Control-Allow-Origin: *
< Content-Type: application/octet-stream
< Date: Tue, 20 Feb 2018 16:27:37 GMT
< 
FILE_CONTENT
* Closing connection 0

Notice < Connection: close and * Closing connection 0.

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